TOF

The TOF wall is made of 6 sectors, in hexagonal geometry, each one constituted by 8 cases containing 8 scintillating bars. Each bar will be read at the two ends by means of fast photomultipliers (EMI 9133B), in order to reconstruct with a good accuracy the time of flight from the target (σ=100-150 ps) and the hit position along the bar itself (sigma=1.5-2.3 cm). The TOF main tasks are to measure the hadron multiplicity, in order to trigger on the centrality of the collision (e.g. in Au+Au collision at 1AGeV) and to perform the electron/hadron discrimination.